nix: use GHC9.6.5

Author: mgmeier

bench/tx-generator/tx-generator.cabal

@@ -25,9 +25,9 @@ common with-library
   -- This is the inverse to the "buildable" GHC version constraint in plutus-scripts-bench.
   -- It makes sure, we only depend on that package if it is buildable.
   -- The tx-generator will fall back to pre-serialized Plutus scripts if this package is not present.
-  if !(impl(ghc <9.6) || impl(ghc >=9.7))
-    build-depends:      plutus-scripts-bench ^>= 1.0.4
-    cpp-options:        -DWITH_LIBRARY
+  -- if !(impl(ghc <9.6) || impl(ghc >=9.7))
+  --   build-depends:      plutus-scripts-bench ^>= 1.0.4
+  --   cpp-options:        -DWITH_LIBRARY
 
 common maybe-unix
   if !os(windows)

nix/haskell.nix

@@ -21,9 +21,9 @@ let
     {
       src = ../.;
       name = "cardano-node";
-      compiler-nix-name = lib.mkDefault "ghc8107";
+      compiler-nix-name = lib.mkDefault "ghc96";
       # extra-compilers
-      flake.variants = lib.genAttrs ["ghc96"] (x: {compiler-nix-name = x;});
+      flake.variants = lib.genAttrs ["ghc8107"] (x: {compiler-nix-name = x;});
       cabalProjectLocal = ''
         repository cardano-haskell-packages-local
           url: file:${CHaP}